add notes to env, uglify, and json plugins
add notes to env, uglify, and json plugins

pnml/fuse-box,fuse-box/fuse-box,pnml/fuse-box,rs3d/fuse-box,pnml/fuse-box,fuse-box/fuse-box,fuse-box/fuse-box,rs3d/fuse-box,rs3d/fuse-box,fuse-box/fuse-box